Abstract: A cardiopulmonary bypass or CPB monitoring tool includes: a preoperative information module; a preoperative calculation module able to estimate a body surface area, blood volume, and theoretical weight; a priming module able to determine priming constitution, volume and flow to achieve a hemodilution target; an operation risk module for calculating operation risk; a drug calculation module able to determine medication doses; a timer module with timers that can be activated during operation; a data collection module with an interface and drivers enabling data collection from a wide variety of extracorporeal pumps and oxygenators during operation; an events module with retroactive manipulation of the time of an event; a printing report generation module; a graphic user interface; and a configuration module.